/plugin-creator

Plugin JSON sample spec

{
  "name": "plugin-name",
  "version": "1.2.0",
  "description": "Brief plugin description",
  "author": {
    "name": "Author Name",
    "email": "author@example.com",
    "url": "https://github.com/author"
  },
  "homepage": "https://docs.example.com/plugin",
  "repository": "https://github.com/author/plugin",
  "license": "MIT",
  "keywords": ["keyword1", "keyword2"],
  "skills": "./skills/",
  "hooks": "./hooks.json",
  "mcpServers": "./.mcp.json",
  "apps": "./.app.json",
  "interface": {
    "displayName": "Plugin Display Name",
    "shortDescription": "Short description for subtitle",
    "longDescription": "Long description for details page",
    "developerName": "OpenAI",
    "category": "Productivity",
    "capabilities": ["Interactive", "Write"],
    "websiteURL": "https://openai.com/",
    "privacyPolicyURL": "https://openai.com/policies/row-privacy-policy/",
    "termsOfServiceURL": "https://openai.com/policies/row-terms-of-use/",
    "defaultPrompt": [
      "Summarize my inbox and draft replies for me.",
      "Find open bugs and turn them into Linear tickets.",
      "Review today's meetings and flag scheduling gaps."
    ],
    "brandColor": "#3B82F6",
    "composerIcon": "./assets/icon.png",
    "logo": "./assets/logo.png",
    "screenshots": [
      "./assets/screenshot1.png",
      "./assets/screenshot2.png",
      "./assets/screenshot3.png"
    ]
  }
}

Field guide

Top-level fields

• name (string): Plugin identifier (kebab-case, no spaces). Required if plugin.json is provided and used as manifest name and component namespace.
• version (string): Plugin semantic version.
• description (string): Short purpose summary.
• author (object): Publisher identity.
  • name (string): Author or team name.
  • email (string): Contact email.
  • url (string): Author/team homepage or profile URL.
• homepage (string): Documentation URL for plugin usage.
• repository (string): Source code URL.
• license (string): License identifier (for example MIT, Apache-2.0).
• keywords (array of string): Search/discovery tags.
• skills (string): Relative path to skill directories/files.
• hooks (string): Hook config path.
• mcpServers (string): MCP config path.
• apps (string): App manifest path for plugin integrations.
• interface (object): Interface/UX metadata block for plugin presentation.

interface fields

• displayName (string): User-facing title shown for the plugin.
• shortDescription (string): Brief subtitle used in compact views.
• longDescription (string): Longer description used on details screens.
• developerName (string): Human-readable publisher name.
• category (string): Plugin category bucket.
• capabilities (array of string): Capability list from implementation.
• websiteURL (string): Public website for the plugin.
• privacyPolicyURL (string): Privacy policy URL.
• termsOfServiceURL (string): Terms of service URL.
• defaultPrompt (array of string): Starter prompts shown in composer/UX context.
  • Include at most 3 strings. Entries after the first 3 are ignored and will not be included.
  • Each string is capped at 128 characters. Longer entries are truncated.
  • Prefer short starter prompts around 50 characters so they scan well in the UI.
• brandColor (string): Theme color for the plugin card.
• composerIcon (string): Path to icon asset.
• logo (string): Path to logo asset.
• screenshots (array of string): List of screenshot asset paths.
  • Screenshot entries must be PNG filenames and stored under ./assets/.
  • Keep file paths relative to plugin root.

Path conventions and defaults

• Path values should be relative and begin with ./.
• skills, hooks, and mcpServers are supplemented on top of default component discovery; they do not replace defaults.
• Custom path values must follow the plugin root convention and naming/namespacing rules.
• This repo’s scaffold writes .codex-plugin/plugin.json; treat that as the manifest location this skill generates.

Marketplace JSON sample spec

marketplace.json depends on where the plugin should live:

• Repo plugin: <repo-root>/.agents/plugins/marketplace.json
• Local plugin: ~/.agents/plugins/marketplace.json

{
  "name": "openai-curated",
  "interface": {
    "displayName": "ChatGPT Official"
  },
  "plugins": [
    {
      "name": "linear",
      "source": {
        "source": "local",
        "path": "./plugins/linear"
      },
      "policy": {
        "installation": "AVAILABLE",
        "authentication": "ON_INSTALL"
      },
      "category": "Productivity"
    }
  ]
}

Marketplace field guide

Top-level fields

• name (string): Marketplace identifier or catalog name.
• interface (object, optional): Marketplace presentation metadata.
• plugins (array): Ordered plugin entries. This order determines how Codex renders plugins.

interface fields

• displayName (string, optional): User-facing marketplace title.

Plugin entry fields

• name (string): Plugin identifier. Match the plugin folder name and plugin.json name.
• source (object): Plugin source descriptor.
  • source (string): Use local for this repo workflow.
  • path (string): Relative plugin path based on the marketplace root.
    • Repo plugin: ./plugins/<plugin-name>
    • Local plugin in ~/.agents/plugins/marketplace.json: ./plugins/<plugin-name>
  • The same relative path convention is used for both repo-rooted and home-rooted marketplaces.
    • Example: with ~/.agents/plugins/marketplace.json, ./plugins/<plugin-name> resolves to ~/plugins/<plugin-name>.
• policy (object): Marketplace policy block. Always include it.
  • installation (string): Availability policy.
    • Allowed values: NOT_AVAILABLE, AVAILABLE, INSTALLED_BY_DEFAULT
    • Default for new entries: AVAILABLE
  • authentication (string): Authentication timing policy.
    • Allowed values: ON_INSTALL, ON_USE
    • Default for new entries: ON_INSTALL
  • products (array of string, optional): Product override for this plugin entry. Omit it unless product gating is explicitly requested.
• category (string): Display category bucket. Always include it.

Marketplace generation rules

• displayName belongs under the top-level interface object, not individual plugin entries.
• When creating a new marketplace file from scratch, seed interface.displayName alongside top-level name.
• Always include policy.installation, policy.authentication, and category on every generated or updated plugin entry.
• Treat policy.products as an override and omit it unless explicitly requested.
• Append new entries unless the user explicitly requests reordering.
• Replace an existing entry for the same plugin only when overwrite is intentional.
• Choose marketplace location to match the plugin destination:
  • Repo plugin: <repo-root>/.agents/plugins/marketplace.json
  • Local plugin: ~/.agents/plugins/marketplace.json